linux-kernel - Re: [ovs-dev] [PATCH net-next] net: openvswitch: allow providing upcall pid for the 'execute' command

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Message-ID: <5c0e9359-6bdd-4d49-b427-8fd1e8802b7c@ovn.org>
Date: Thu, 3 Jul 2025 10:38:49 +0200
From: Ilya Maximets <i.maximets@....org>
To: Flavio Leitner <fbl@...close.org>
Cc: i.maximets@....org, netdev@...r.kernel.org, dev@...nvswitch.org,
 linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
 Simon Horman <horms@...nel.org>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net>
Subject: Re: [ovs-dev] [PATCH net-next] net: openvswitch: allow providing
 upcall pid for the 'execute' command

On 7/3/25 1:08 AM, Flavio Leitner wrote:
>>>> @@ -651,6 +654,10 @@ static int ovs_packet_cmd_execute(struct sk_buff
>>>> *skb, struct genl_info *info) !!(hash & OVS_PACKET_HASH_L4_BIT));
>>>>  	}
>>>>  
>>>> +	if (a[OVS_PACKET_ATTR_UPCALL_PID])
>>>> +		upcall_pid =
>>>> nla_get_u32(a[OVS_PACKET_ATTR_UPCALL_PID]);
>>>> +	OVS_CB(packet)->upcall_pid = upcall_pid;
> 
> Since this is coming from userspace, does it make sense to check if the
> upcall_pid is one of the pids in the dp->upcall_portids array?

Not really.  IMO, this would be an unnecessary artificial restriction.
We're not concerned about security here since OVS_PACKET_CMD_EXECUTE
requires the same privileges as the OVS_DP_CMD_NEW or the
OVS_DP_CMD_SET.

Best regards, Ilya Maximets.